North Americmi Rliynchoyliora. 255 



elytra is mentioned as being '^ very irregularly sinuous." This 

 expression will scarcely apply to significans and arcuahis — the 

 only two which can be reasonably selected to compare with 

 ohscuriis — as in these species the transverse band is but very 

 slightly uneven. 



In form these species are all more or less cylindrical anteriorly, 

 with the elytra strongly inflated,, the integuments very densely 

 squamose, and the claws rather approximate. 



S. $>ig^iiificaii§ n. sp.— Sides of the prothorax and elytra pale luteous, 

 the pale tint crossing the elytra posteriorly in a broadly, feebly sinuate 

 band edged anteriorly with piceous ; remainder of the upper surface 

 very dark reddish-brown; median pale line of pronotum exceedingly 

 narrow and feeble and only visible toward base; abdomen very sparsely 

 squamose toward apex, rather densely so toward base, sparsely clothed 

 with erect pale hairs. Head and beak very slightly longer than the 

 prothorax, gradually narrowed from base to apex; eyes large, convex, 

 at nearly their own length from the base; front depressed, with an 

 elongate canaliculate puncture between the eyes ; transverse impression 

 very feeble; beak as long as wide, very feebly and obsoletely carinate 

 along the middle; scrobes very short, deep, cavernous, convergent, 

 vanishing at their own length from the eyes; apex between them tri- 

 angularly impressed and almost glabrous, the bottom more declivous at 

 the apex; antennae long and slender; scape feebly arcuate, setose, very 

 sparsely squamose above; funicle slender, not more robust toward apex, 

 basal joint slightly less than one-half longer than the second, first four 

 joints decreasing uniformly and rapidly in length. Prothorax cylin- 

 drical, slightly wider than long, broadly constricted in the apical third; 

 sides feebly arcuate in the middle; disk rather coarsely, deeply, but 

 not densely punctate, sparsely and finely setose; setse subrecumbent. 

 Elytra strongly inflated, more than twice as wide as the prothorax, 

 nearly one-half longer than wide, very acute at apex; sides arcuate; 

 disk convex, tumid along the suture behind, very finely and feebly 

 striate; strige finely, feebly, and very distantly punctate; intervals very 

 feebly convex, each with a widely distant row of small subrecumbent 

 setae. Legs slightly more sparsely squamose, setose. Abdomen feebly 

 convex; first suture feebly arcuate in the middle; second segment one- 

 half longer than the third; third and fourth subequal. Length 4.0-6.0 



California (Mendocino Co. 2 ; Humboldt Co. 12). 



In this species the central parts of the disk are very deep in 

 color, the outer portions pale and the lines of demarcation very 

 strong and distinct; the setae assumed the color of the surround- 

 ing scales. The claws appear to be very slightly connate at base,. 



